Android - use external profile image in notification bar like Facebook

This statement will use a method to convert a URL (naturally, one that points to an image) into a Bitmap.

Bitmap bitmap = getBitmapFromURL("https://graph.facebook.com/YOUR_USER_ID/picture?type=large");

Note: Since you mention a Facebook profile, I have included an URL that gets your the large size profile picture of a Facebook User. You can however, change this to any URL that points to an image that you need to display in the Notification.

And the method that will get the image from the URL you specified in the statement above:

public Bitmap getBitmapFromURL(String strURL) {
    try {
        URL url = new URL(strURL);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(input);
        return myBitmap;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

Now pass the bitmap instance created above to the Notification.Builder instance. I call it builder in this example code. It is used in this line: builder.setLargeIcon(bitmap);. I am assuming you know how to display the actual Notification and it's configurations. So I will skip that part and add just the builder.

// CONSTRUCT THE NOTIFICATION DETAILS
builder.setAutoCancel(true);
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setContentTitle("Some Title");
builder.setContentText("Some Content Text");
builder.setLargeIcon(bitmap);
builder.setContentIntent(pendingIntent);

Oh, almost forgot, if you haven't already done so, you will need this permission setup in the Manifest:

<uses-permission android:name="android.permission.INTERNET" />

download image first using below code:

private Bitmap getBitmap(String url)
    {
        File f=fileCache.getFile(url);

        //from SD cache
        Bitmap b = decodeFile(f);
        if(b!=null)
            return b;

        //from web
        try {
            Bitmap bitmap=null;
            URL imageUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
            conn.setConnectTimeout(30000);
            conn.setReadTimeout(30000);
            conn.setInstanceFollowRedirects(true);
            InputStream is=conn.getInputStream();
            OutputStream os = new FileOutputStream(f);
            Utils.CopyStream(is, os);
            os.close();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Exception ex){
           ex.printStackTrace();
           return null;
        }
    }

    //decodes image and scales it to reduce memory consumption
    private Bitmap decodeFile(File f){
        try {
            //decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(new FileInputStream(f),null,o);

            //Find the correct scale value. It should be the power of 2.
            final int REQUIRED_SIZE=70;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            while(true){
                if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                    break;
                width_tmp/=2;
                height_tmp/=2;
                scale*=2;
            }

            //decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize=scale;
            return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
        } catch (FileNotFoundException e) {}
        return null;
    }

use that image as bitmap in below code:

Bitmap icon1 = downloadedBitmap;

            NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
                    this).setAutoCancel(true)
                    .setContentTitle("DJ-Android notification")
                    .setSmallIcon(R.drawable.ic_launcher)
                    .setContentText("Hello World!");

            NotificationCompat.BigPictureStyle bigPicStyle = new NotificationCompat.BigPictureStyle();
            bigPicStyle.bigPicture(icon1);
            bigPicStyle.setBigContentTitle("Dhaval Sodha Parmar");
            mBuilder.setStyle(bigPicStyle);

            // Creates an explicit intent for an Activity in your app
            Intent resultIntent = new Intent(this, testActivity.class);

            // The stack builder object will contain an artificial back stack
            // for
            // the
            // started Activity.
            // This ensures that navigating backward from the Activity leads out
            // of
            // your application to the Home screen.
            TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);

            // Adds the back stack for the Intent (but not the Intent itself)
            stackBuilder.addParentStack(testActivity.class);

            // Adds the Intent that starts the Activity to the top of the stack
            stackBuilder.addNextIntent(resultIntent);
            PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(
                    0, PendingIntent.FLAG_UPDATE_CURRENT);
            mBuilder.setContentIntent(resultPendingIntent);

            NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

            // mId allows you to update the notification later on.
            mNotificationManager.notify(100, mBuilder.build());

i thing you k'no about android permission:

<uses-permission android:name="android.permission.INTERNET" />

for more detail check this artical and android developer